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ID:46629554
大小:2.41 MB
页数:5页
时间:2019-11-26
《TA15钛合金电子束焊缝形貌及其组织研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、TAl5钛合金电子束焊缝形貌及其组织研究旷小聪1,2,卜文德1,付鹏飞2,王西昌2,柯黎明1(1.南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063;2.中国航空制造技术研究院高能束流加工技术重点实验室,北京100024)[摘要】采用不同工艺参数对TAl5钛合金进行电子柬焊接,通过观察焊缝形貌、测量其形状参数研究了焊接接头形貌的变化规律,并分析了焊接接头组织。结果表明:增大电子束流时,熔深、半熔深熔宽、焊缝宽度都增大,焊缝横截面的形状从“钉形”转变为“钟罩形”;增大焊接速度,对焊缝形状影响不大,熔深、半熔深熔宽及焊缝
2、宽度均减小,深宽比先增大后减小;聚焦电流的增大对熔深作用较明显,半熔深熔宽及焊缝宽度变化不大;扫描幅值的增加使焊缝熔深减小,半熔深熔宽增大。靠近母材的热影响区组织与母材组织相近,主要由初生等轴状O/.相及转变B相组成,并出现针状(0【+B);靠近熔合线的组织由o【相和针状(d+B)相构成,并出现O/7马氏体;熔合区组织由口’组成,熔合线周围柱状晶垂直于焊缝中心生长,并在焊缝中心形成单列或多列的等轴状晶。关键词:TAl5钛合金;电子束焊接;焊缝形貌;显微组织StudyontheMorphologyandMicrostructureofT
3、Al5TitaniumAlloyEBWWeldedJointKUANGXiaocon91⋯,PUWendel,FUPengfei2,WANGXichan92,KELimin91(1.NationalDefenseKeyDisciplinesLaboratoryofLightAlloyProcessingScienceandTechnology,NanchangHangkongUniversity,Nanchang330063,China;2.PowerBeamProcessingLaboratory,AVICManufacturing
4、TechnologyInstitute,Beijing100024,China)【ABSTRACT】Inthisarticle,TA15titaniumalloywasweldedbyelectronbeamweldingwithdifferentprocessparam—eters,themorphologyofweldedjointswereinvestigatedbyobservingthemorphologyoftheweldedjointsandmeasuringtheshapeparameters,andthemicros
5、tructureoftheweldingjointwasanalyzed.Theresultsshowthattheweldpenetration,halfofwidthandweldwidthincreasewhentheelectroncurrentincreases,andtheweldshapechangesfromthenailshapetothebellshape.Theweldingspeedhaslittleeffectontheweldshape,theweldpenetration,halfofwidthandwe
6、ldwidthdecreaseswiththeincreaseoftheweldingspeed,andtheratioofdepthtowidthincreasesfirstandthendecreases.Theincreaseoffocusingcurrenthasalargeeffectontheweldpenetration,butthehalfofwidthandweldwidthchangelittle.whenthescanningamplitudeincreases,theweldpenetrationdecreas
7、es,halfofwidthincreases.Theheataffectedzone(HAZ)nearthebasemetalwassimilartothebasemetal.Whichwasmainlycomposedoftheprimaryequiaxedc【phaseandtrans—formedpphase,andtheacicular(时p);TheHAZnearthefusionlinewasconsistof0【phaseandacicular(叶p),andappearⅡ7;themicrostructureoffu
8、sionzonewascc‘,thecolumnarcrystalsgrewperpendicularlytotheweldcenter,andsingleormultiplecolumnsofequiaxedgrain
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